Strong-Field-Enhanced Spectroscopy in Silicon Nanoparticle Electric and Magnetic Dipole Resonance near a Metal Surface

Abstract

Strong-field-enhanced spectroscopy in a hybrid dipole resonance system composed of a low-loss semiconductor nanoparticle and metal film is proposed and demonstrated. This hybrid Si nanoparticle on silver system is featuring extraordinary near-field enhancement and large field confinement. Extensive numerical calculations are carried out to investigate the influence of the gap size, particle diameter, and metal substrate on the near-field enhancement response in the Si particle–metal gap in order to properly model their hybridization. Our analysis reveals that this near-field enhancement originates from the strong gap magnetic resonance response by the Si nanoparticle dipole interaction with metal mirror image and metal film surface plasmon effects. We further demonstrate the strong enhanced Raman spectroscopy of a single silicon nanoparticle over Ag film with a precisely sized molecular spacer layer between them. These results illustrate the capacity and tunability of the low-loss silicon particle on the metal system on surface-enhanced spectroscopic techniques as well as possible applications in optical circuits or building new metamaterials.

Electromagnetically induced transparency of a plasmonic metamaterial light absorber based on multilayered metallic nanoparticle sheets

“…Recently, interactions of the electromagnetic modes through the mirror image were reported for silicon nanoparticles on a metal substrate2728. Xifré-Pérez et al .…”

“…Huang et al . reported that the Si nanoparticle dipole interaction with the mirror image results in two peaks for both the electric and magnetic resonances28. Mode coupling through the mirror image effect for structure-less thin films on metal substrates is the simplest structure that can induce the EIT effect, although it has not yet been reported.…”

Enhancement of Raman scattering in dielectric nanostructures with electric and magnetic Mie resonances

“…(15). Thus, for a given excitation frequency ω the Raman signal will be resonantly enhanced either when |c 1 (ω)| or c (2) 1 (ω s ) reaches their maximal values.…”

“…However, plasmonic structures have a higher level of local electric field enhancement due to the resonant excitation of localized surface modes, and are actively used for enhancing the Raman signal from external sources, e.g., molecules or nanocrystals [11][12][13][14]. In stark contrast with metal, non-plasmonic materials often support their own internal Raman response, which -as proven -can be exploited as an additional degree of freedom for optical characterization [15][16][17].…”

All-Dielectric Nanophotonics: Fundamentals, Fabrication, and Applications

“…This magnetic light concept has paved the way for many fascinating applications in the areas of quantum source emission engineering [49][50][51][52][53][54][55][56][57] (Figure 1(a)), frequency conversion [58] (Figure 1(b)), tunable routers and switchers [59][60][61] (Figure 1(c)), sensors [62][63][64] (FigSilicon Silicon dielectric permittivity conduction current/polarization current real part imaginary part…”